gulp pipe(gulp.dest()) does not create any results

Question

i am currently learning about gulp.js. as i saw the tutorial and documentation of gulp.js, this code:

gulp.src('js/*.js')
.pipe(uglify())
.pipe(gulp.dest('minjs'));

makes the uglified javascript file with create new directory named 'minjs'. of course, i installed gulp-uglity with --dev-save option. there is no error message on the console so i don't know what is the problem. i tried gulp with "sudo", but still not working.

so i went to the root directory and searched all filesystem but there is no file named 'minjs' so i guess it just not working. why this is happening? anyone knows this problem, it would be nice why this is happening.

whole source code:

var gulp = require('gulp');
var uglify = require('gulp-uglify');

gulp.task('default', function() {
    console.log('mifying scripts...');

    gulp.src('js/*.js')
    .pipe(uglify())
    .pipe(gulp.dest('minjs'));
});

Answer 1

Finally I resolved the question like this:

It was a directory mistake so the gulp task hasn't matched any files; then it couldn't create the dest directory (because no files in output).

const paths = {
  dest: {
    lib: './lib',
    esm: './esm',
    dist: './dist',
  },
  styles: 'src/components/**/*.less',
  scripts: ['src/components/**/*.{ts,tsx}', '!src/components/**/demo/*.{ts,tsx}'],
};

At first my scripts was ['components/**/*.{ts,tsx}', '!components/**/demo/*.{ts,tsx}']

And that hasn't matched any files.